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I've been coaching some Silvers and the peek with the crosshair is perfect but they end up panic spraying and dying because they don't let go of the keys and aim.
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You actually have a lot more time than you think so let go off the keys and burst or tap to secure the kill instead of panic crouch spraying trying not to die.
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Counterstrafing or movements between each shot is good but often people do it too much and end up missing shots and kills they easily should be getting.